inFAMOUS 1 sold significantly more than Demon's Souls at the time. That's not a knock against Demon's Souls, but it seems like there's some rewriting of history to put Demon's on a much higher pedestal than it was back then. It was most certainly well received by many gamers that gave it a shot, but as far as widespread commercial appeal, it was pretty niche. By comparison, inFAMOUS and its sequel were much more broadly appealing to gamer, and its critical and commercial success reflects that. Demon's Souls was a harder sell at the time.
It wasn't until Namco published Dark Souls, that the genre really exploded, and then, in hindsight, more gamers became interested/intrigued by the game that "started it all", but by then, it wasn't particularly easy to get a hold of (no digital release, if I remember correctly).
Demon's Souls is still my favorite of the Souls series (with the exception of Bloodborne), and now I'm super glad that more people can now play the excellent remake. I think a Bluepoint remake of inFAMOUS 1 and 2 would be huge, and totally fits with the types of games Bluepoint targets for Remasters and Remakes. In their engine, it would look phenomenal.